Why it matters

Prompt injection unsolvable but detectable in many cases. Understanding shapes defense.

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The architecture

Pattern matching: known injection phrases.

Classifier: ML-based detection.

Prompt injection detectionPattern matchknown phrasesML classifierlearned patternsCombinationlayered detectionMeta's PromptGuard is popular open classifier
Injection detection.
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How it works end to end

Patterns: 'ignore instructions', role-play attempts, code injection.

ML classifiers: PromptGuard, custom.

Content markers: mark untrusted text in prompt.

Response: block, sanitize, or flag for review.